The Dissociation of Video Head Impulse Test (vHIT) and Bithermal Caloric Test Results Provide Topological Localization of Vestibular System Impairment in Patients With "Definite" Meniere's Disease

Purpose: We report 3 patients with Meniere's disease and describe how the combination of audiometry, video head impulse testing, and caloric results may prove helpful in the diagnosis of Meniere's disease. Method: Three patients with "definite" Meniere's disease were evaluated in a tertiary care medical center. Each patient underwent videonystagmography, horizontal canal video head impulse testing, and audiometry. Results: All 3 patients demonstrated moderate, flat, sensorineural hearing losses; significant caloric asymmetries; and bilaterally normal video head impulse testing. This pattern of findings suggests differential preservation of high-frequency function (video head impulse testing) with impairment of low-frequency function (unilaterally abnormal caloric test results) in these patients. Conclusion: Ipsilesional abnormal caloric testing in the presence of normal video head impulse testing is a pattern of findings observed in a cohort of patients who have "definite" Meniere's disease.